Lens Mounting; Back Flange Distance - Point Grey Flea3 GigE Technical Reference

Point Grey Flea3 GigE Technical Reference
4.4

Lens Mounting

Lenses are not included with individual cameras.
Related Knowledge Base Articles
Selecting a lens for your camera
The lens mount is compatible with C-mount lenses. Correct focus cannot be achieved using a CS-mount lens on a C-
mount camera.
The FL3-GE-13S2 model is also available with a CS-mount.
4.4.1

Back Flange Distance

The Back Flange Distance (BFD) is offset due to the presence of both a 1 mm infrared cutoff (IRC) filter and a 0.5 mm
sensor package window. These two pieces of glass fit between the lens and the sensor image plane. The IRC filter is
installed on color cameras. In monochrome cameras, it is a transparent piece of glass. The sensor package window is
installed by the sensor manufacturer. Both components cause refraction, which requires some offset in flange back
distance to correct.
The resulting C-mount BFD is 17.99 mm.
For more information about the IRC filter, see
Revised 10/29/2013
Copyright ©2010-2013 Point Grey Research Inc.
Title
Knowledge Base Article 345
Article
Infrared Cut-Off Filters.
4 Flea3 GigE Physical Interface
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